Brake with spaced lining segments



March 3, 1959 R. 1.. STREBINGER BRAKE WITH SPACED LINING sscuau'is 2Sheets-Sheet 1 Filed Jan. 17, 1955 a In! I lll'll'lllllll-lll I II II F1 INVENTOR.

R0552! L. ST EBINGER amid. 5 ATT RNEY March 3,1959 R. 1.. S'i'REBlNGER2, 5

BRAKE vu'm sPAcEn LINING sscusu'rs' Filed Jan. 17. 1955 2 Sheet-Sheet 2COO IN VEN TOR.

B03221 LnSTREBINGER ATTORNEY Patented Mar. 3, 1959 a... r nn tenn shrality of arcuate lining strips 24 I secured to the, "surface of the-rimsomepreferred manner e. g. boa Id .A Mini ,1 ,E i U su sss fiat vmmentsnn thehrake shoe paratenzones, o th drum surface 116 whichare 1 um-s .Q Q i'zflmt C E I [e zone trimaran hit-Aha; lining segegzonesiAthroughsE,

. a ifi l fihexdmmisrexposed .greate dutionon-periodduringjeachrevolutiomof vehicle performance indicates th icenergise- 3 sorption requ'rement for brakes will become successivelygreateni i v g qtiethesshoe'iiaa'lhimhas not Rate. of lining veardepends in s i ,causetheioperating tem- 135 1 864, istpossiblextoadividefithe I 5 'fi uce?thelining areaswithout of 'ear fof the liningtonthe lining arid =drum'diminishesso the bi e es efie'ctiveness'and (4)hydraulic fluid is heatedtd such a degree that boiling and vaporizationzof the fluid is not u comm 'lhepres'e'nt invention is 'desi ll" he itted thqtfihp lining 'segments-ionlthej-secondns se ble r e-43 gned toalleviate these the primary shoe 12, the reason being that the secondaryconditions by obtaining a cooler running brake. shoe 10 absorbs more ofthe kinetic energy of a stop The invention has for its objects, amongothers: during braking with forward vehicle movement. The (a) Decreasingthe period of time during which any greater area of lining on thesecondary shoe makes it possection of a rotatable drum is engageablewith a frictionsible to construct the shoe ring so that both the primaryproducing surface. and secondary shoes have a substantially equal wearlife. (b) Improving heat dissipation by exposing the sur- Another shoeconstruction which I have found reduces face of the rotatable member forlonger periods of time, brake temperatures is shown in Figures 5 to 7.The lining to thereby enable convection currents and radiation torestrips or segments 24a are arranged transversely on rim duce operatingtemperatures. 20a. These segments are spaced apart to provide inter-Other objects and improvements of the invention will vals during whichthe engageable surface of the drum is become evident from aconsideration of the following de- 45 exposed. The time during which anyportion of the drum scription, in which a plurality of exampleembodiments surface 24a is eng g has been y E l'cdllced are consideredin connection with the following drawings, because of the spacing of thelining segments; During the wherein: time intervals in which the drumsurface is exposed, there Figure 1 is a fragmentary isometric view ofone of the is improved heat dispersion through convection currents brakeshoes and brake drum; and radiation. A plurality of openings 30 may bepro- Figure 2 is a fragmentary isometric vie of a second vided in therim 20a to promote circulation of air through brake shoe and brake drum;the brake and across the drum surface, to promote cooling Figure 3 is atop view of the brake shoe shown in Figf the bra eure 1; Various liningsegment spacings may be resorted to Figure 4 i a section i taken on i 44 f i in accomplishing the objects of the invention. All of these ure 3;spacings are aimed toward decreasing the time during Figure 5 is anelevation view of a second brake shoe Which the drum is engaged; ly,increasing e constituting another embodiment of the invention; andPeriod of exposure of the drum Surface- V ous addi- Figure 6 is a sideview of Figure 5 looking from the left tional p g of lining SegmentsWill 060 t those h d id h f; d skilled in the art, and such revisions ofthe embodiments Figure 7 is a section view taken on line 7-7 of Fig-'ShOWn here y he made Without p rting from the re underlying principlesof the invention.

Referring to the drawings, and specifically the embodi- I claim! mentshown in Figures 1 to 4, brake shoes 10 and 12 are An articulatad P ofbrake Shoes, each comprising engageable with cyclindrical surface 16 ofdrum 18. Orn arcuate rim, a r nsverse strengthening web, and a dinarily,the brake shoes are a stationary part of the brake, pl r li y of f icton material lining segments secured to and engage an anchor in the usualmanner to impede rothe rims of said shoes, said segments being securedalong tation of the drum. The drum 18 is secured to a rotatable theedges and mid-Portion 0f the secondary shoe, said part of the vehicle asfor example, a hub (not shown). segments secured to the primary shoebeing arranged to There is provided the usual pair of brake shoesformpresent friction surfaces alternating with the friction suring ashoe ring. Each of the brake shoes is inclusive faces of the segments onsaid secondary shoe, said segments being thereby positioned to tracesubstantially distinct paths on a rotating member which are cumulativein width to the width of the rims of said primary and secondary brakeshoes.

2. A brake comprising a brake drum' having :1 cylindricalfriction-elemept-engaging surface, a pair of brake shoes each inclusiveof a rim and transverse strengthening web, and a plurality of frictionlining segments secured to the rims of said shoes, one of said shoeshaving the segments thereon arranged to present axially separatedfriction producing surfaces, the other of said shoes having the segmentsthereon arranged to present axially separated friction producingsurfaces, the surfaces of said lining segments being so located to tracealternating paths on the cylindrical surface of said drum so thatsections of the cylindrical surface of said drum are engageable with thefriction producing surfaces of lining segments on onlyone of said shoes.

3. In a brake, a brake drum having a cylindricalfriction-element-engaging surface, a plurality of axially alignedinterconnected brake shoes, each having a plurality of axiallyspaced-apart arcuate lining segments secured thereto, and a plurality ofzones on the cylindrical friction-element-engaging surface of said drum,each of said zones being engageable with a lining segment on only one ofsaid shoes so that alternating zones on the cylindrical surface of saiddrum are contacted by alternating lining segments on a respective shoe.

4.1a a brake, a plurality of end-to-end friction-producing elementsarranged in substantially coplanar relation, and a rotatable drum havinga cylindrical surface engageable with said elements, said elements beingarranged to trace distinctive zones on the surface of said rotatabledrum so that portions of said rotatable drum are engageable with onlyone of the plurality of frictionof said segments, and a plurality ofzones of the cylindrical surface of said rotatable member which areengageable with the friction surfaces associated with only one of saidbrake shoes.

6. In a brake, a pair of brake shoes arranged in endtoend relation, eachof said shoes having segments of friction lining constructed in arcuatestrips which extend along the length of the brake shoe and are laterallyspaced-apart, the lining segments on said respective shoes beingrelatively spaced with respect to each other to form a staggered patternof friction lining surfaces which are distinct with respect to each shoeand form a continuous friction surface which is of no greater width thanthe shoes taken separately.

I References Clted in the file of this patent UNITED STATES PATENTS774,448 Norris Nov. 8, 1904 1,877,430 Skopik Sept. 13, 1932 2,384,614Forbes Sept. 11, 1945 2,661,819 Strohm Dec. 8, 1953 FOREIGN PATENTS74,405 Switzerland Feb. 16, 1917

